- ER+/HER2+ breast, ovarian, cervical, endometrial cancer, or other solid cancers, resistance to standard therapies with a PIK3CA gene mutation (Part C), AKT1 gene mutation (Part D) or a dysregulatory aberration on the PIK/AKT pathway (Part D), advanced or metastatic ER+ positive breast cancer that has an AKT1 gene mutation (Part E) or advanced or metastatic ER+ positive breast cancer that has a PTEN gene mutation (Part F).